> On Mon, Jan 28, 2008 at 01:18:03AM +1100, Simon Burge wrote:
> > At least MIPS and PowerPC will generate "pref" and "dcbt" instructions
> > respectively that point to potentially invalid addresses with the code
> > as it currently is.
>
> I remember some discussion of the Power4 modifications for Linux to map
> NULL for the same reason. If in doubt, we can conditionalize that
> statement for platforms that don't have a save prefetch.
>
> Joerg
just FYI:
http://www.kerneltraffic.org/kernel-traffic/kt20031006_234.html#3
(i don't know if __builtin_prefetch can produce the relevant instructions.)
YAMAMOTO Takashi